My Plasma Cutter Is Overheating

A plasma cutter can cut through sheet metal.

A plasma cutter makes clean, precise cuts in metal by using a plasma arc, which is controlled by the nozzle on the plasma cutter. The cutting process produces a great deal of heat that can damage the plasma cutter when run for long periods. Using the plasma cutter for shorter intervals may prevent it from overheating.

Things You'll Need

• Owner's manual
• Screwdriver
• Safety glasses
• Welding clothing

Instructions

1. Turn off the plasma cutter and let it cool down. Turn on the machine again and listen for the fan to start if you have a model with a continuous fan.

2. Check the owner's manual for the duty cycle requirements and don't run the plasma cutter above these requirements. Duty cycle is the number of minutes in a 10-minute period that the plasma cutter can be operated at capacity, according to the website Miller Welds. For example, run your 300-ampere plasma cutter for six minutes at a time when the duty cycle is set at 60 percent.

3. Turn off and unplug the plasma cutter if the fan doesn't start up. Disassemble the plasma cutter case with a screwdriver to access the fan. Clear out any debris from the fan and reassemble the plasma cutter case.

4. Put on a pair of safety glasses and plug in the plasma cutter. To prevent overheating, turn on the machine in pilot arc mode only when you're ready to make the cut. Position the machine so it's out of range of flying particles that can clog the fan.

5. Set the plasma's current to the maximum amperes when you begin a cut. Gradually reduce the amperes as you cut to prevent an excess of heat buildup.

Tips & Warnings

• Wear proper welding clothing as well as shaded eye protection.

References

• Miller Welds: Plasma Cutting Guide